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<H2><A NAME="7_10">7.10 Handling date/time scales</A></H2>
<P> With date/time scale we refer to the plotting of data where the
 independent variable (X-axis) de-nominates a time value. This could for
 example be the temperature measured in intervals during a day.</P>
<P> From version 1.18 and onwards there are two principal ways of
 handling date/time scales. The manual way and fully automatic using the
 special &quot;dat&quot; scale. For most cases the automatic &quot;dat&quot; scale is the
 preferred choice but in rare circumstances it might be more appropriate
 to use the manual way since it gives slightly more control (but not
 that much) of the overall handling of scales.</P>
<P> To be able to use a date/time scale at all we will assume that the
 data points are represented by both an X coordinate (time-value) and a
 Y-value (anything else wouldn't make sense).</P>
<P> We first start by describing the use of the &quot;dat&quot; scale.</P>
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